ARCv2: clocksource: Rename GRTC -> GFRC ...

... it is now called Global Free Running Counter

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 6312f60..bb15e80 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -413,7 +413,7 @@
 	default n
 	depends on !SMP
 
-config ARC_HAS_GRTC
+config ARC_HAS_GFRC
 	bool "SMP synchronized 64-bit cycle counter"
 	default y
 	depends on SMP